What is the strength of 1st quality brick?
Answers
What is the compressive strength of a brick?
Originally Answered: What is the compressive strength of brick?
Compressive strength of a brick is determined by testing the brick under standard conditions using a Compression testing machine. The procedure as mentioned in IS 3495 (Part-2) shall be used to determine the compressive strength of brick work.
The following apparatus is required for testing the brick
Measure scale
Compression Testing Machine
Compressive Strength of bricks is determined by placing brick in compression testing machine. After placing the brick in compression testing machine, apply load on it until brick breaks. Note down the value of failure load and find out the crushing strength value of brick. Minimum crushing strength of brick is 3.50N/mm2. If it is less than 3.50 N/mm2, then it is not useful for construction purpose.
Calculation: -
Compressive Strength of Bricks = Maximum Load at Failure (N)/Average area of bed face (mm2)
The average of result shall be reported.
Calculation: -
Compressive Strength of Bricks = Maximum Load at Failure (N)/Average area of bed face (mm2)
The average of result shall be reported.
Compressive strength of bricks are very variable, and may vary from 30 kg/sq. cm to 150 kg/sq. cm for hand-made burnt bricks, while compressive strength of heavy duty bricks machine pressed (also called engineering bricks) may have compressive strength as high as 450 kg/sq. cm, and even 500 kg/sq. cm.
The minimum Compressive Strengths of burnt bricks : -
· Common building bricks—35 kg/sq. cm,
· Second class bricks—70 kg/sq. cm,
· First class bricks— 105 kg/sq. cm.
· Compressive Strength of bricks not less than 140 kg/sq. cm are graded as AA class.
The strength of bricks decreases by about 25 per cent when soaked in water.
Strength of sun-dried (un burnt) bricks is from 15 to 25 kg/sq. cm.
Common building bricks - 3.5Mpa, Second class bricks - 7 Mpa, First class bricks - 10.5Mpa. The minimum crushing / compressive strengths of burnt bricks tested flat-wise prescribed are: (i) Common building bricks—35 kg/sq. cm, (ii) Second class bricks—70 kg/sq. cm, (iii) First class bricks— 105 kg/sq. cm